How to fix "ruby installation is missing psych (for YAML output)." on CentOS?

Posted by ohho on Server Fault See other posts from Server Fault or by ohho
Published on 2012-10-25T02:27:45Z Indexed on 2012/10/25 11:03 UTC
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After rvm installation on CentOS 5.8:

[[email protected] ~]$ rvm -v
rvm 1.16.17
[[email protected] ~]$ which ruby
~/.rvm/rubies/ruby-1.9.3-p286/bin/ruby
[[email protected] ~]$ ruby -v
ruby 1.9.3p286 (2012-10-12 revision 37165) [i686-linux]
[[email protected] ~]$ which gem
~/.rvm/rubies/ruby-1.9.3-p286/bin/gem

there is a warning:

$ gem -v
/home/rails/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
1.8.24

I followed some advice:

$ rvm pkg install libyaml
Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src
Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4.
Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4.
Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4.
Installing yaml to /home/rails/.rvm/usr

Please note that it's required to reinstall all rubies:

    rvm reinstall all --force

and then:

$ rvm reinstall all --force
Removing /home/rails/.rvm/src/ruby-1.8.7-p371...
Removing /home/rails/.rvm/rubies/ruby-1.8.7-p371...
No binary rubies available for: centos/5.8/i386/ruby-1.8.7-p371.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.8.7-p371, this may take a while depending on your cpu(s)...
ruby-1.8.7-p371 - #downloading ruby-1.8.7-p371, this may take a while depending on your connection...
ruby-1.8.7-p371 - #extracting ruby-1.8.7-p371 to /home/rails/.rvm/src/ruby-1.8.7-p371
ruby-1.8.7-p371 - #extracted to /home/rails/.rvm/src/ruby-1.8.7-p371
Applying patch /home/rails/.rvm/patches/ruby/1.8.7/stdout-rouge-fix.patch
Applying patch /home/rails/.rvm/patches/ruby/1.8.7/no_sslv2.diff
ruby-1.8.7-p371 - #configuring
ruby-1.8.7-p371 - #compiling
ruby-1.8.7-p371 - #installing 
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.8.7-p371 ...
Installation of rubygems completed successfully.
Saving wrappers to '/home/rails/.rvm/bin'.
ruby-1.8.7-p371 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.8.7-p371 - #importing default gemsets (/home/rails/.rvm/gemsets/)
Install of ruby-1.8.7-p371 - #complete 
Please be aware that you just installed a ruby that requires 2 patches just to be compiled on up to date linux system.
This may have known and unaccounted for security vulnerabilities.
Please consider upgrading to Ruby 1.9.3-286 which will have all of the latest security patches.
Making gemset ruby-1.8.7-p371 pristine.
Making gemset [email protected] pristine.
Removing /home/rails/.rvm/src/ruby-1.9.3-p286...
Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286...
No binary rubies available for: centos/5.8/i386/ruby-1.9.3-p286.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)...
ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection...
ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #configuring
ruby-1.9.3-p286 - #compiling
ruby-1.9.3-p286 - #installing 
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.9.3-p286 ...
Installation of rubygems completed successfully.
Saving wrappers to '/home/rails/.rvm/bin'.
ruby-1.9.3-p286 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.9.3-p286 - #importing default gemsets (/home/rails/.rvm/gemsets/)
Install of ruby-1.9.3-p286 - #complete 
Making gemset ruby-1.9.3-p286 pristine.
Making gemset [email protected] pristine.

Too bad, the warning is still there:

$ gem -v
/home/rails/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
1.8.24

How can I get rid of the warning?

UPDATE: (applying rvm reinstall 1.9.3 --movable)

$ rvm reinstall 1.9.3 --movable
Removing /home/rails/.rvm/src/ruby-1.9.3-p286...
Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286...
Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src
Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4.
Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4.
Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4.
Installing yaml to /home/rails/.rvm/rubies/ruby-1.9.3-p286
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)...
ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection...
ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286
Applying patch /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch
Error running 'patch -F 25 -p1 -N -f -i /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch', please read /home/rails/.rvm/log/ruby-1.9.3-p286/patch.apply.ruby-multilib.log
There has been an error applying the specified patches. Halting the installation.
Making gemset ruby-1.9.3-p286 pristine.
Making gemset [email protected] pristine.

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